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If you find video editors to be confusing and all you need is to just cut a portion of a video, you can try LosslessCut, an application available for Linux, Windows and Mac.

LosslessCut was especially created to make it easy to quickly extract parts of video files from a video camera, GoPro, drone, and so on, without losing video quality.

The application is based on Chromium, using a HTML5 video player, and it uses FFmpeg for cutting the videos.

According to its GitHub page, LosslessCut doesn't re-encode or decode the videos, making it very fast and especially useful for large videos.

LosslessCut features:

lossless video cutting

take JPG snapshots of the video (at least on Linux, the snapshots - which are created in the same folder as the video -, are actually PNG, so if you have trouble opening them, rename the files from .jpg to .png);

supports the following formats/codecs: MP4, MOV, WebM, MKV, OGG, WAV, MP3, AAC, H264, Theora, VP8, VP9. A complete list can be found HERE (since it uses Chromium and the HTML5 video player, not all formats supported by FFmpeg work);

keyboard shortcuts (press "h" to see a list of keyboard shortcuts).

To use LosslessCut, add the video either by drag and drop or from its menu, then simply select the start (represented by the "<" icon in the LosslessCut user interface - 1 in the screenshot below) and end (">" - 2) time of the video you want to cut, then click the scissors (3) icon to export it:

Unless you choose a different output folder, the video should be exported in the same directory as the original.